We have bought a house with a garage attached to it (the house was split two third one third (the one third being the garage) but the owners don't want to sell us the garage. They say they have planning permission to make it into a home and they are going to convert it and live in it. This means two things. The first is that our house will become a semi and the second is that their windows overlook part of our garden on one side and they can see into our garden on the other side through their windows and above the garden wall.
Can we object to the conversion work taking place (they already have planning permission) and if so, what are the chances of our objection being upheld?
Thank you

Thank you for your prompt reply. When we bought the house we were aware that the garage had planning permission but the agreement was that we would purchase the garage at a later date (nothing recorded formally) because we didn't want any neighbours. The sellers, unfortunately, changed their minds and decided to keep it for themselves.
Thank you